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Unless it has haste as well, it sucks a million. Even so it's still not very good.
Creatures don't have "summoning sickness" anymore, we just call it that due to ol days. Now, a creature that didn't start the turn under your control can't attack or tap, unless it has haste. So you'd be only ceating a sacrificial fodder for some other effect, at most.
Mutavault is a land that can turn into a creature. It is treated as a land in that you may tap it for mana on your first turn, but if you activate it for it's creature abilities, the game recongnizes that the card "mutavault" just came into play during your turn and that "mutavault" is a creature, therefore has summoning sickness and cannot attack without haste, but may block and also be used for abilities of other creatures (example: tap 2 untapped creatures you control; effect). So the short answer is that if mutavault just came under your control, then yes, it needs haste to attack as a creature. If mutavault has been in play at least one turn under your control, then you may attack with it as normal.